package demo1;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class TcpEchoServer {
     private ServerSocket socket  ;

    public TcpEchoServer(int port) throws IOException {
        this.socket = new ServerSocket(port);
    }
     public void start() throws IOException {
         System.out.println("服务器启动");
         ExecutorService service = Executors.newCachedThreadPool();
         while(true){
             Socket clientSocket = socket.accept() ;
             service.submit(new Runnable() {
                 @Override
                 public void run() {
                  processConnection(clientSocket);
                 }
             });

         }
    }
    private void processConnection(Socket clientSocket)  {
        System.out.printf("[%s,%d] 客户端上线\n" , clientSocket.getInetAddress() , clientSocket.getPort());
        try(InputStream inputStream = clientSocket.getInputStream() ;
            OutputStream outputStream = clientSocket.getOutputStream()) {
            while(true){
                Scanner scan = new Scanner(inputStream) ;
                if(!scan.hasNext()){
                    System.out.printf("[%s,%d] 客户端下线\n" , clientSocket.getInetAddress() , clientSocket.getPort());
                    break ;
                }
                String request = scan.next() ;
                String response = process(request);
                PrintWriter writer = new PrintWriter(outputStream) ;
                writer.println(response);
                writer.flush();
                System.out.printf("[%s,%d]request:%s , response=%s \n" ,
                        clientSocket.getInetAddress() , clientSocket.getPort() , request , response);

            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally{
            try {
                clientSocket.close();
            } catch (IOException e) {
                e.printStackTrace();
             }
        }


    }

    private String process(String request) {
        return request ;
    }


    public static void main(String[] args) throws IOException {
     TcpEchoServer server = new TcpEchoServer(9090);
     server.start();
    }
}
